Users of Windows who have set the Automatic Updates option to "Download updates for me, but let me choose when to install them" were surprised to find that the latest WMF patch had overridden these settings and not only installed the patch, but rebooted the machines as well.

Ok, a few things to point out here:
(1): Microsoft can afford much better and many more lawyers than you can.
(2): Microsoft engineered their EULA to keep themselves safe from the consiquences of stuff like this.
(3): The Microsoft patch as is understood by the general public, was not malicious but rather an important update.

I do not condone what Microsoft did, but at the same time I don't think you'll see them loosing in court over it during your lifetime.